What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Thank you for contacting us. I have create a sample form that you may clone if you like
In this sample you you will notice that I added 3 number fields and a Form Calculation widget field
The Form Calculation enables to due simple calculation between fields
When you open the wizard, you may add the fields by pressing ADD FIELD and select the type of algorithm you wish. Once you have finished press the FINISH button to save changes.
Please let us know if this helps.